Protoplanet Vesta, visited by NASA's Dawn spacecraft from 2011 to 2013, was once thought to be completely dry, incapable of retaining water because of the low temperatures and pressures at its surface.

NASA Television and the agency's website will provide live coverage from 6-8:30 a.m. PST (9-11:30 a.m. EST) of the European Space Agency (ESA) Rosetta mission's scheduled landing of a probe on a comet on Wednesday, Nov. 12.

On Thursday, June 19, NASA will host a televised update on recent progress and upcoming milestones in the agency's efforts to identify, capture and relocate an asteroid, and send astronauts to take samples of it in the 2020s.

The probability asteroid 2013 TV135 could impact Earth is only one in 63,000. Additional observations are likely to result in a dramatic reduction, or complete elimination, of any risk of Earth impact.